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Fig. 7.


Top panel: semi-major axis of the ellipse as a function of time. The solid line indicates the best-fit power-law relation r ∼ tp, p = 0.68 ± 0.04. Bottom panel: ejecta advance velocity obtained from the expansion fit (solid line) and from simple averages in separate time intervals (grey shaded rectangles). For comparison, the Hα FWHM time evolution by Munari et al. (2011, dashed line) is also plotted. The blue (red) points indicate the maximum positive (absolute negative) radial velocity for Hα from Shore et al. (2011).

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